New submission from Renato Alves:
Hi everyone,
I'm not really sure if this is a new issue but digging through the bug reports
from the past I couldn't find an answer.
There's http://bugs.python.org/issue1438480 but this seems to be a different
issue.
I also found http://bugs.python.org/issue9993 that addressed problems with
symlinks but didn't correct the behavior reported here.
The problem can be visualized with the following code.
Code fails on python 2.7 as well as python 3.4+. Not tested in python <2.7 and
<3.4.
import shutil
import os
TMPDIR = "/tmp/tmpdir"
TESTLINK = "test_dir"
if not os.path.isdir(TMPDIR):
os.mkdir(TMPDIR)
if not os.path.islink(TESTLINK):
os.symlink(TMPDIR, TESTLINK)
shutil.move(TESTLINK, TMPDIR)
When executed it gives me:
% python3 test.py
Traceback (most recent call last):
File "test.py", line 14, in
shutil.move(TESTLINK, TMPDIR)
File "/usr/lib64/python3.4/shutil.py", line 516, in move
os.rename(src, dst)
OSError: [Errno 18] Invalid cross-device link: 'test_dir' -> '/tmp/tmpdir'
This happens because /tmp is:
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime,nodiratime)
In the past the recommendation to handle this problem was to stop using
os.rename and use shutil.move instead.
This was even discussed in a bug report - http://bugs.python.org/issue14848
If one searches for this exception there's plenty of advice [1][2][3][4] in the
same direction.
However, given that shutil.move uses os.rename internally, the problem returns.
On the other end doing the equivalent action in the shell with 'mv' works fine.
[1] - http://stackoverflow.com/a/15300474
[2] - https://mail.python.org/pipermail/python-list/2005-February/342892.html
[3] -
http://www.thecodingforums.com/threads/errno-18-invalid-cross-device-link-using-os-rename.341597/
[4] - https://github.com/pypa/pip/issues/103
--
components: Library (Lib)
messages: 263616
nosy: Unode
priority: normal
severity: normal
status: open
title: shutil.move fails to move symlink (Invalid cross-device link)
versions: Python 3.4
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